aboutsummaryrefslogtreecommitdiffstats
path: root/src/libcharon/sa/ikev1/tasks/main_mode.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libcharon/sa/ikev1/tasks/main_mode.c')
-rw-r--r--src/libcharon/sa/ikev1/tasks/main_mode.c1155
1 files changed, 1155 insertions, 0 deletions
diff --git a/src/libcharon/sa/ikev1/tasks/main_mode.c b/src/libcharon/sa/ikev1/tasks/main_mode.c
new file mode 100644
index 000000000..7f263260c
--- /dev/null
+++ b/src/libcharon/sa/ikev1/tasks/main_mode.c
@@ -0,0 +1,1155 @@
+/*
+ * Copyright (C) 2011 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "main_mode.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <sa/ikev1/keymat_v1.h>
+#include <crypto/diffie_hellman.h>
+#include <encoding/payloads/sa_payload.h>
+#include <encoding/payloads/ke_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+#include <encoding/payloads/id_payload.h>
+#include <encoding/payloads/hash_payload.h>
+#include <sa/ikev1/tasks/xauth.h>
+#include <sa/ikev1/tasks/mode_config.h>
+#include <sa/ikev1/tasks/informational.h>
+#include <sa/ikev1/tasks/isakmp_delete.h>
+
+typedef struct private_main_mode_t private_main_mode_t;
+
+/**
+ * Private members of a main_mode_t task.
+ */
+struct private_main_mode_t {
+
+ /**
+ * Public methods and task_t interface.
+ */
+ main_mode_t public;
+
+ /**
+ * Assigned IKE_SA.
+ */
+ ike_sa_t *ike_sa;
+
+ /**
+ * Are we the initiator?
+ */
+ bool initiator;
+
+ /**
+ * IKE config to establish
+ */
+ ike_cfg_t *ike_cfg;
+
+ /**
+ * Peer config to use
+ */
+ peer_cfg_t *peer_cfg;
+
+ /**
+ * Local authentication configuration
+ */
+ auth_cfg_t *my_auth;
+
+ /**
+ * Remote authentication configuration
+ */
+ auth_cfg_t *other_auth;
+
+ /**
+ * selected IKE proposal
+ */
+ proposal_t *proposal;
+
+ /**
+ * DH exchange
+ */
+ diffie_hellman_t *dh;
+
+ /**
+ * Keymat derivation (from SA)
+ */
+ keymat_v1_t *keymat;
+
+ /**
+ * Received public DH value from peer
+ */
+ chunk_t dh_value;
+
+ /**
+ * Initiators nonce
+ */
+ chunk_t nonce_i;
+
+ /**
+ * Responder nonce
+ */
+ chunk_t nonce_r;
+
+ /**
+ * Encoded SA initiator payload used for authentication
+ */
+ chunk_t sa_payload;
+
+ /**
+ * Negotiated SA lifetime
+ */
+ u_int32_t lifetime;
+
+ /**
+ * Negotiated authentication method
+ */
+ auth_method_t auth_method;
+
+ /** states of main mode */
+ enum {
+ MM_INIT,
+ MM_SA,
+ MM_KE,
+ MM_AUTH,
+ } state;
+};
+
+/**
+ * Get the first authentcation config from peer config
+ */
+static auth_cfg_t *get_auth_cfg(peer_cfg_t *peer_cfg, bool local)
+{
+ enumerator_t *enumerator;
+ auth_cfg_t *cfg = NULL;
+
+ enumerator = peer_cfg->create_auth_cfg_enumerator(peer_cfg, local);
+ enumerator->enumerate(enumerator, &cfg);
+ enumerator->destroy(enumerator);
+ return cfg;
+}
+
+/**
+ * Create an authenticator, if supported
+ */
+static authenticator_t *create_authenticator(private_main_mode_t *this,
+ id_payload_t *id)
+{
+ authenticator_t *authenticator;
+ authenticator = authenticator_create_v1(this->ike_sa, this->initiator,
+ this->auth_method, this->dh,
+ this->dh_value, this->sa_payload,
+ id->get_encoded(id));
+ if (!authenticator)
+ {
+ DBG1(DBG_IKE, "negotiated authentication method %N not supported",
+ auth_method_names, this->auth_method);
+ }
+ return authenticator;
+}
+
+/**
+ * Save the encoded SA payload of a message
+ */
+static bool save_sa_payload(private_main_mode_t *this, message_t *message)
+{
+ enumerator_t *enumerator;
+ payload_t *payload, *sa = NULL;
+ chunk_t data;
+ size_t offset = IKE_HEADER_LENGTH;
+
+ enumerator = message->create_payload_enumerator(message);
+ while (enumerator->enumerate(enumerator, &payload))
+ {
+ if (payload->get_type(payload) == SECURITY_ASSOCIATION_V1)
+ {
+ sa = payload;
+ break;
+ }
+ else
+ {
+ offset += payload->get_length(payload);
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ data = message->get_packet_data(message);
+ if (sa && data.len >= offset + sa->get_length(sa))
+ {
+ /* Get SA payload without 4 byte fixed header */
+ data = chunk_skip(data, offset);
+ data.len = sa->get_length(sa);
+ data = chunk_skip(data, 4);
+ this->sa_payload = chunk_clone(data);
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
+ * Generate and add NONCE, KE payload
+ */
+static bool add_nonce_ke(private_main_mode_t *this, chunk_t *nonce,
+ message_t *message)
+{
+ nonce_payload_t *nonce_payload;
+ ke_payload_t *ke_payload;
+ rng_t *rng;
+
+ ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1,
+ this->dh);
+ message->add_payload(message, &ke_payload->payload_interface);
+
+ rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+ if (!rng)
+ {
+ DBG1(DBG_IKE, "no RNG found to create nonce");
+ return FALSE;
+ }
+ rng->allocate_bytes(rng, NONCE_SIZE, nonce);
+ rng->destroy(rng);
+
+ nonce_payload = nonce_payload_create(NONCE_V1);
+ nonce_payload->set_nonce(nonce_payload, *nonce);
+ message->add_payload(message, &nonce_payload->payload_interface);
+
+ return TRUE;
+}
+
+/**
+ * Extract nonce from NONCE payload, process KE payload
+ */
+static bool get_nonce_ke(private_main_mode_t *this, chunk_t *nonce,
+ message_t *message)
+{
+ nonce_payload_t *nonce_payload;
+ ke_payload_t *ke_payload;
+
+ ke_payload = (ke_payload_t*)message->get_payload(message, KEY_EXCHANGE_V1);
+ if (!ke_payload)
+ {
+ DBG1(DBG_IKE, "KE payload missing in message");
+ return FALSE;
+ }
+ this->dh_value = chunk_clone(ke_payload->get_key_exchange_data(ke_payload));
+ this->dh->set_other_public_value(this->dh, this->dh_value);
+
+ nonce_payload = (nonce_payload_t*)message->get_payload(message, NONCE_V1);
+ if (!nonce_payload)
+ {
+ DBG1(DBG_IKE, "NONCE payload missing in message");
+ return FALSE;
+ }
+ *nonce = nonce_payload->get_nonce(nonce_payload);
+
+ return TRUE;
+}
+
+/**
+ * Get the two auth classes from local or remote config
+ */
+static void get_auth_class(peer_cfg_t *peer_cfg, bool local,
+ auth_class_t *c1, auth_class_t *c2)
+{
+ enumerator_t *enumerator;
+ auth_cfg_t *auth;
+
+ *c1 = *c2 = AUTH_CLASS_ANY;
+
+ enumerator = peer_cfg->create_auth_cfg_enumerator(peer_cfg, local);
+ while (enumerator->enumerate(enumerator, &auth))
+ {
+ if (*c1 == AUTH_CLASS_ANY)
+ {
+ *c1 = (uintptr_t)auth->get(auth, AUTH_RULE_AUTH_CLASS);
+ }
+ else
+ {
+ *c2 = (uintptr_t)auth->get(auth, AUTH_RULE_AUTH_CLASS);
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+}
+
+/**
+ * Get auth method to use from a peer config
+ */
+static auth_method_t get_auth_method(private_main_mode_t *this,
+ peer_cfg_t *peer_cfg)
+{
+ auth_class_t i1, i2, r1, r2;
+
+ get_auth_class(peer_cfg, this->initiator, &i1, &i2);
+ get_auth_class(peer_cfg, !this->initiator, &r1, &r2);
+
+ if (i1 == AUTH_CLASS_PUBKEY && r1 == AUTH_CLASS_PUBKEY)
+ {
+ if (i2 == AUTH_CLASS_ANY && r2 == AUTH_CLASS_ANY)
+ {
+ /* TODO-IKEv1: ECDSA? */
+ return AUTH_RSA;
+ }
+ if (i2 == AUTH_CLASS_XAUTH)
+ {
+ return AUTH_XAUTH_INIT_RSA;
+ }
+ if (r2 == AUTH_CLASS_XAUTH)
+ {
+ return AUTH_XAUTH_RESP_RSA;
+ }
+ }
+ if (i1 == AUTH_CLASS_PSK && r1 == AUTH_CLASS_PSK)
+ {
+ if (i2 == AUTH_CLASS_ANY && r2 == AUTH_CLASS_ANY)
+ {
+ return AUTH_PSK;
+ }
+ if (i2 == AUTH_CLASS_XAUTH)
+ {
+ return AUTH_XAUTH_INIT_PSK;
+ }
+ if (r2 == AUTH_CLASS_XAUTH)
+ {
+ return AUTH_XAUTH_RESP_PSK;
+ }
+ }
+ if (i1 == AUTH_CLASS_XAUTH && r1 == AUTH_CLASS_PUBKEY &&
+ i2 == AUTH_CLASS_ANY && r2 == AUTH_CLASS_ANY)
+ {
+ return AUTH_HYBRID_INIT_RSA;
+ }
+ return AUTH_NONE;
+}
+
+/**
+ * Check if a peer skipped authentication by using Hybrid authentication
+ */
+static bool skipped_auth(private_main_mode_t *this, bool local)
+{
+ bool initiator;
+
+ initiator = local == this->initiator;
+ if (initiator && this->auth_method == AUTH_HYBRID_INIT_RSA)
+ {
+ return TRUE;
+ }
+ if (!initiator && this->auth_method == AUTH_HYBRID_RESP_RSA)
+ {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
+ * Check if remote authentication constraints fulfilled
+ */
+static bool check_constraints(private_main_mode_t *this)
+{
+ identification_t *id;
+ auth_cfg_t *auth;
+
+ auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+ /* auth identity to comply */
+ id = this->ike_sa->get_other_id(this->ike_sa);
+ auth->add(auth, AUTH_RULE_IDENTITY, id->clone(id));
+ if (skipped_auth(this, FALSE))
+ {
+ return TRUE;
+ }
+ return auth->complies(auth, this->other_auth, TRUE);
+}
+
+/**
+ * Save authentication information after authentication succeeded
+ */
+static void save_auth_cfg(private_main_mode_t *this, bool local)
+{
+ auth_cfg_t *auth;
+
+ if (skipped_auth(this, local))
+ {
+ return;
+ }
+ auth = auth_cfg_create();
+ /* for local config, we _copy_ entires from the config, as it contains
+ * certificates we must send later. */
+ auth->merge(auth, this->ike_sa->get_auth_cfg(this->ike_sa, local), local);
+ this->ike_sa->add_auth_cfg(this->ike_sa, local, auth);
+}
+
+/**
+ * Select the best configuration as responder
+ */
+static peer_cfg_t *select_config(private_main_mode_t *this, identification_t *id)
+{
+ enumerator_t *enumerator;
+ peer_cfg_t *current, *found = NULL;
+ host_t *me, *other;
+
+ me = this->ike_sa->get_my_host(this->ike_sa);
+ other = this->ike_sa->get_other_host(this->ike_sa);
+ DBG1(DBG_CFG, "looking for %N peer configs matching %H...%H[%Y]",
+ auth_method_names, this->auth_method, me, other, id);
+ enumerator = charon->backends->create_peer_cfg_enumerator(charon->backends,
+ me, other, NULL, id, IKEV1);
+ while (enumerator->enumerate(enumerator, &current))
+ {
+ if (get_auth_method(this, current) == this->auth_method)
+ {
+ found = current->get_ref(current);
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ if (found)
+ {
+ DBG2(DBG_CFG, "selected peer config \"%s\"", found->get_name(found));
+ }
+ return found;
+}
+
+/**
+ * Check for notify errors, return TRUE if error found
+ */
+static bool has_notify_errors(private_main_mode_t *this, message_t *message)
+{
+ enumerator_t *enumerator;
+ payload_t *payload;
+ bool err = FALSE;
+
+ enumerator = message->create_payload_enumerator(message);
+ while (enumerator->enumerate(enumerator, &payload))
+ {
+ if (payload->get_type(payload) == NOTIFY_V1)
+ {
+ notify_payload_t *notify;
+ notify_type_t type;
+
+ notify = (notify_payload_t*)payload;
+ type = notify->get_notify_type(notify);
+ if (type < 16384)
+ {
+ DBG1(DBG_IKE, "received %N error notify",
+ notify_type_names, type);
+ err = TRUE;
+ }
+ else if (type == INITIAL_CONTACT_IKEV1)
+ {
+ if (!this->initiator && this->state == MM_AUTH)
+ {
+ /* If authenticated and received INITIAL_CONTACT,
+ * delete any existing IKE_SAs with that peer.
+ * The delete takes place when the SA is checked in due
+ * to other id not known until the 3rd message.*/
+ this->ike_sa->set_condition(this->ike_sa,
+ COND_INIT_CONTACT_SEEN, TRUE);
+ }
+ }
+ else
+ {
+ DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
+ }
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ return err;
+}
+
+/**
+ * Queue a task sending a notify in an INFORMATIONAL exchange
+ */
+static status_t send_notify(private_main_mode_t *this, notify_type_t type)
+{
+ notify_payload_t *notify;
+ ike_sa_id_t *ike_sa_id;
+ u_int64_t spi_i, spi_r;
+ chunk_t spi;
+
+ notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
+ PROTO_IKE, type);
+ ike_sa_id = this->ike_sa->get_id(this->ike_sa);
+ spi_i = ike_sa_id->get_initiator_spi(ike_sa_id);
+ spi_r = ike_sa_id->get_responder_spi(ike_sa_id);
+ spi = chunk_cata("cc", chunk_from_thing(spi_i), chunk_from_thing(spi_r));
+ notify->set_spi_data(notify, spi);
+
+ this->ike_sa->queue_task(this->ike_sa,
+ (task_t*)informational_create(this->ike_sa, notify));
+ /* cancel all active/passive tasks in favour of informational */
+ return ALREADY_DONE;
+}
+
+/**
+ * Queue a delete task if authentication failed as initiator
+ */
+static status_t send_delete(private_main_mode_t *this)
+{
+ this->ike_sa->queue_task(this->ike_sa,
+ (task_t*)isakmp_delete_create(this->ike_sa, TRUE));
+ /* cancel all active tasks in favour of informational */
+ return ALREADY_DONE;
+}
+
+METHOD(task_t, build_i, status_t,
+ private_main_mode_t *this, message_t *message)
+{
+ switch (this->state)
+ {
+ case MM_INIT:
+ {
+ sa_payload_t *sa_payload;
+ linked_list_t *proposals;
+ packet_t *packet;
+
+ this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+ DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
+ this->ike_sa->get_name(this->ike_sa),
+ this->ike_sa->get_unique_id(this->ike_sa),
+ this->ike_sa->get_other_host(this->ike_sa));
+ this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
+
+ this->peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+ this->peer_cfg->get_ref(this->peer_cfg);
+
+ this->my_auth = get_auth_cfg(this->peer_cfg, TRUE);
+ this->other_auth = get_auth_cfg(this->peer_cfg, FALSE);
+ if (!this->my_auth || !this->other_auth)
+ {
+ DBG1(DBG_CFG, "no auth config found");
+ return FAILED;
+ }
+ this->auth_method = get_auth_method(this, this->peer_cfg);
+ if (this->auth_method == AUTH_NONE)
+ {
+ DBG1(DBG_CFG, "configuration uses unsupported authentication");
+ return FAILED;
+ }
+ this->lifetime = this->peer_cfg->get_reauth_time(this->peer_cfg,
+ FALSE);
+ if (!this->lifetime)
+ { /* fall back to rekey time of no rekey time configured */
+ this->lifetime = this->peer_cfg->get_rekey_time(this->peer_cfg,
+ FALSE);
+ }
+ proposals = this->ike_cfg->get_proposals(this->ike_cfg);
+ sa_payload = sa_payload_create_from_proposals_v1(proposals,
+ this->lifetime, 0, this->auth_method, MODE_NONE, FALSE);
+ proposals->destroy_offset(proposals, offsetof(proposal_t, destroy));
+
+ message->add_payload(message, &sa_payload->payload_interface);
+
+ /* pregenerate message to store SA payload */
+ if (this->ike_sa->generate_message(this->ike_sa, message,
+ &packet) != SUCCESS)
+ {
+ DBG1(DBG_IKE, "pregenerating SA payload failed");
+ return FAILED;
+ }
+ packet->destroy(packet);
+ if (!save_sa_payload(this, message))
+ {
+ DBG1(DBG_IKE, "SA payload invalid");
+ return FAILED;
+ }
+
+ this->state = MM_SA;
+ return NEED_MORE;
+ }
+ case MM_SA:
+ {
+ u_int16_t group;
+
+ if (!this->keymat->create_hasher(this->keymat, this->proposal))
+ {
+ return send_notify(this, NO_PROPOSAL_CHOSEN);
+ }
+ if (!this->proposal->get_algorithm(this->proposal,
+ DIFFIE_HELLMAN_GROUP, &group, NULL))
+ {
+ DBG1(DBG_IKE, "DH group selection failed");
+ return send_notify(this, NO_PROPOSAL_CHOSEN);
+ }
+ this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
+ group);
+ if (!this->dh)
+ {
+ DBG1(DBG_IKE, "negotiated DH group not supported");
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ if (!add_nonce_ke(this, &this->nonce_i, message))
+ {
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ this->state = MM_KE;
+ return NEED_MORE;
+ }
+ case MM_KE:
+ {
+ authenticator_t *authenticator;
+ id_payload_t *id_payload;
+ identification_t *id;
+
+ id = this->my_auth->get(this->my_auth, AUTH_RULE_IDENTITY);
+ if (!id)
+ {
+ DBG1(DBG_CFG, "own identity not known");
+ return send_notify(this, INVALID_ID_INFORMATION);
+ }
+
+ this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
+
+ id_payload = id_payload_create_from_identification(ID_V1, id);
+ message->add_payload(message, &id_payload->payload_interface);
+
+ authenticator = create_authenticator(this, id_payload);
+ if (!authenticator || authenticator->build(authenticator,
+ message) != SUCCESS)
+ {
+ DESTROY_IF(authenticator);
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+ authenticator->destroy(authenticator);
+ save_auth_cfg(this, TRUE);
+
+ this->state = MM_AUTH;
+ return NEED_MORE;
+ }
+ default:
+ return FAILED;
+ }
+}
+
+METHOD(task_t, process_r, status_t,
+ private_main_mode_t *this, message_t *message)
+{
+ switch (this->state)
+ {
+ case MM_INIT:
+ {
+ linked_list_t *list;
+ sa_payload_t *sa_payload;
+
+ this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+ DBG0(DBG_IKE, "%H is initiating a Main Mode",
+ message->get_source(message));
+ this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
+
+ this->ike_sa->update_hosts(this->ike_sa,
+ message->get_destination(message),
+ message->get_source(message), TRUE);
+
+ sa_payload = (sa_payload_t*)message->get_payload(message,
+ SECURITY_ASSOCIATION_V1);
+ if (!sa_payload || !save_sa_payload(this, message))
+ {
+ DBG1(DBG_IKE, "SA payload missing or invalid");
+ return send_notify(this, INVALID_PAYLOAD_TYPE);
+ }
+
+ list = sa_payload->get_proposals(sa_payload);
+ this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
+ list, FALSE);
+ list->destroy_offset(list, offsetof(proposal_t, destroy));
+ if (!this->proposal)
+ {
+ DBG1(DBG_IKE, "no proposal found");
+ return send_notify(this, NO_PROPOSAL_CHOSEN);
+ }
+
+ this->auth_method = sa_payload->get_auth_method(sa_payload);
+ this->lifetime = sa_payload->get_lifetime(sa_payload);
+
+ this->state = MM_SA;
+ return NEED_MORE;
+ }
+ case MM_SA:
+ {
+ u_int16_t group;
+
+ if (!this->keymat->create_hasher(this->keymat, this->proposal))
+ {
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ if (!this->proposal->get_algorithm(this->proposal,
+ DIFFIE_HELLMAN_GROUP, &group, NULL))
+ {
+ DBG1(DBG_IKE, "DH group selection failed");
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ this->dh = lib->crypto->create_dh(lib->crypto, group);
+ if (!this->dh)
+ {
+ DBG1(DBG_IKE, "negotiated DH group not supported");
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ if (!get_nonce_ke(this, &this->nonce_i, message))
+ {
+ return send_notify(this, INVALID_PAYLOAD_TYPE);
+ }
+ this->state = MM_KE;
+ return NEED_MORE;
+ }
+ case MM_KE:
+ {
+ authenticator_t *authenticator;
+ id_payload_t *id_payload;
+ identification_t *id;
+
+ id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
+ if (!id_payload)
+ {
+ DBG1(DBG_IKE, "IDii payload missing");
+ return send_notify(this, INVALID_PAYLOAD_TYPE);
+ }
+
+ id = id_payload->get_identification(id_payload);
+ this->ike_sa->set_other_id(this->ike_sa, id);
+ this->peer_cfg = select_config(this, id);
+ if (!this->peer_cfg)
+ {
+ DBG1(DBG_IKE, "no peer config found");
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+ this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
+
+ this->my_auth = get_auth_cfg(this->peer_cfg, TRUE);
+ this->other_auth = get_auth_cfg(this->peer_cfg, FALSE);
+ if (!this->my_auth || !this->other_auth)
+ {
+ DBG1(DBG_IKE, "auth config missing");
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+
+ authenticator = create_authenticator(this, id_payload);
+ if (!authenticator || authenticator->process(authenticator,
+ message) != SUCCESS)
+ {
+ DESTROY_IF(authenticator);
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+ authenticator->destroy(authenticator);
+ if (!check_constraints(this))
+ {
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+ save_auth_cfg(this, FALSE);
+
+ this->state = MM_AUTH;
+ if (has_notify_errors(this, message))
+ {
+ return FAILED;
+ }
+ return NEED_MORE;
+ }
+ default:
+ return FAILED;
+ }
+}
+
+/**
+ * Lookup a shared secret for this IKE_SA
+ */
+static shared_key_t *lookup_shared_key(private_main_mode_t *this)
+{
+ host_t *me, *other;
+ identification_t *my_id, *other_id;
+ shared_key_t *shared_key = NULL;
+
+ /* try to get a PSK for IP addresses */
+ me = this->ike_sa->get_my_host(this->ike_sa);
+ other = this->ike_sa->get_other_host(this->ike_sa);
+ my_id = identification_create_from_sockaddr(me->get_sockaddr(me));
+ other_id = identification_create_from_sockaddr(other->get_sockaddr(other));
+ if (my_id && other_id)
+ {
+ shared_key = lib->credmgr->get_shared(lib->credmgr, SHARED_IKE,
+ my_id, other_id);
+ }
+ DESTROY_IF(my_id);
+ DESTROY_IF(other_id);
+ if (shared_key)
+ {
+ return shared_key;
+ }
+
+ if (this->my_auth && this->other_auth)
+ { /* as initiator, use identities from configuraiton */
+ my_id = this->my_auth->get(this->my_auth, AUTH_RULE_IDENTITY);
+ other_id = this->other_auth->get(this->other_auth, AUTH_RULE_IDENTITY);
+ if (my_id && other_id)
+ {
+ shared_key = lib->credmgr->get_shared(lib->credmgr, SHARED_IKE,
+ my_id, other_id);
+ }
+ else
+ {
+ DBG1(DBG_IKE, "no shared key found for '%Y'[%H] - '%Y'[%H]",
+ my_id, me, other_id, other);
+ }
+ }
+ else
+ { /* as responder, we try to find a config by IP */
+ enumerator_t *enumerator;
+ auth_cfg_t *my_auth, *other_auth;
+ peer_cfg_t *peer_cfg = NULL;
+
+ enumerator = charon->backends->create_peer_cfg_enumerator(
+ charon->backends, me, other, NULL, NULL, IKEV1);
+ while (enumerator->enumerate(enumerator, &peer_cfg))
+ {
+ my_auth = get_auth_cfg(peer_cfg, TRUE);
+ other_auth = get_auth_cfg(peer_cfg, FALSE);
+ if (my_auth && other_auth)
+ {
+ my_id = my_auth->get(my_auth, AUTH_RULE_IDENTITY);
+ other_id = other_auth->get(other_auth, AUTH_RULE_IDENTITY);
+ if (my_id && other_id)
+ {
+ shared_key = lib->credmgr->get_shared(lib->credmgr,
+ SHARED_IKE, my_id, other_id);
+ if (shared_key)
+ {
+ break;
+ }
+ else
+ {
+ DBG1(DBG_IKE, "no shared key found for "
+ "'%Y'[%H] - '%Y'[%H]", my_id, me, other_id, other);
+ }
+ }
+ }
+ }
+ enumerator->destroy(enumerator);
+ if (!peer_cfg)
+ {
+ DBG1(DBG_IKE, "no shared key found for %H - %H", me, other);
+ }
+ }
+ return shared_key;
+}
+
+/**
+ * Derive key material for this IKE_SA
+ */
+static bool derive_keys(private_main_mode_t *this, chunk_t nonce_i,
+ chunk_t nonce_r)
+{
+ ike_sa_id_t *id = this->ike_sa->get_id(this->ike_sa);
+ shared_key_t *shared_key = NULL;
+
+ switch (this->auth_method)
+ {
+ case AUTH_PSK:
+ case AUTH_XAUTH_INIT_PSK:
+ case AUTH_XAUTH_RESP_PSK:
+ shared_key = lookup_shared_key(this);
+ break;
+ default:
+ break;
+ }
+ if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
+ this->dh_value, nonce_i, nonce_r, id, this->auth_method, shared_key))
+ {
+ DESTROY_IF(shared_key);
+ DBG1(DBG_IKE, "key derivation for %N failed",
+ auth_method_names, this->auth_method);
+ return FALSE;
+ }
+ DESTROY_IF(shared_key);
+ charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, nonce_i, nonce_r,
+ NULL);
+
+ return TRUE;
+}
+
+/**
+ * Set IKE_SA to established state
+ */
+static void establish(private_main_mode_t *this)
+{
+ DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+ this->ike_sa->get_name(this->ike_sa),
+ this->ike_sa->get_unique_id(this->ike_sa),
+ this->ike_sa->get_my_host(this->ike_sa),
+ this->ike_sa->get_my_id(this->ike_sa),
+ this->ike_sa->get_other_host(this->ike_sa),
+ this->ike_sa->get_other_id(this->ike_sa));
+
+ this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+ charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
+}
+
+METHOD(task_t, build_r, status_t,
+ private_main_mode_t *this, message_t *message)
+{
+ switch (this->state)
+ {
+ case MM_SA:
+ {
+ sa_payload_t *sa_payload;
+
+ sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
+ this->lifetime, 0, this->auth_method, MODE_NONE, FALSE);
+ message->add_payload(message, &sa_payload->payload_interface);
+
+ return NEED_MORE;
+ }
+ case MM_KE:
+ {
+ if (!add_nonce_ke(this, &this->nonce_r, message))
+ {
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ if (!derive_keys(this, this->nonce_i, this->nonce_r))
+ {
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ return NEED_MORE;
+ }
+ case MM_AUTH:
+ {
+ authenticator_t *authenticator;
+ id_payload_t *id_payload;
+ identification_t *id;
+
+ id = this->my_auth->get(this->my_auth, AUTH_RULE_IDENTITY);
+ if (!id)
+ {
+ DBG1(DBG_CFG, "own identity not known");
+ return send_notify(this, INVALID_ID_INFORMATION);
+ }
+ this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
+
+ id_payload = id_payload_create_from_identification(ID_V1, id);
+ message->add_payload(message, &id_payload->payload_interface);
+
+ authenticator = create_authenticator(this, id_payload);
+ if (!authenticator || authenticator->build(authenticator,
+ message) != SUCCESS)
+ {
+ DESTROY_IF(authenticator);
+ return send_notify(this, AUTHENTICATION_FAILED);
+ }
+ authenticator->destroy(authenticator);
+ save_auth_cfg(this, TRUE);
+
+ if (this->peer_cfg->get_virtual_ip(this->peer_cfg))
+ {
+ this->ike_sa->queue_task(this->ike_sa,
+ (task_t*)mode_config_create(this->ike_sa, TRUE));
+ }
+
+ switch (this->auth_method)
+ {
+ case AUTH_XAUTH_INIT_PSK:
+ case AUTH_XAUTH_INIT_RSA:
+ case AUTH_HYBRID_INIT_RSA:
+ this->ike_sa->queue_task(this->ike_sa,
+ (task_t*)xauth_create(this->ike_sa, TRUE));
+ return SUCCESS;
+ case AUTH_XAUTH_RESP_PSK:
+ case AUTH_XAUTH_RESP_RSA:
+ case AUTH_HYBRID_RESP_RSA:
+ /* TODO-IKEv1: not yet supported */
+ return FAILED;
+ default:
+ establish(this);
+ return SUCCESS;
+ }
+ }
+ default:
+ return FAILED;
+ }
+}
+
+METHOD(task_t, process_i, status_t,
+ private_main_mode_t *this, message_t *message)
+{
+ switch (this->state)
+ {
+ case MM_SA:
+ {
+ linked_list_t *list;
+ sa_payload_t *sa_payload;
+ auth_method_t auth_method;
+ u_int32_t lifetime;
+
+ sa_payload = (sa_payload_t*)message->get_payload(message,
+ SECURITY_ASSOCIATION_V1);
+ if (!sa_payload)
+ {
+ DBG1(DBG_IKE, "SA payload missing");
+ return send_notify(this, INVALID_PAYLOAD_TYPE);
+ }
+ list = sa_payload->get_proposals(sa_payload);
+ this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
+ list, FALSE);
+ list->destroy_offset(list, offsetof(proposal_t, destroy));
+ if (!this->proposal)
+ {
+ DBG1(DBG_IKE, "no proposal found");
+ return send_notify(this, NO_PROPOSAL_CHOSEN);
+ }
+
+ lifetime = sa_payload->get_lifetime(sa_payload);
+ if (lifetime != this->lifetime)
+ {
+ DBG1(DBG_IKE, "received lifetime %us does not match configured "
+ "%us, using lower value", lifetime, this->lifetime);
+ }
+ this->lifetime = min(this->lifetime, lifetime);
+ auth_method = sa_payload->get_auth_method(sa_payload);
+ if (auth_method != this->auth_method)
+ {
+ DBG1(DBG_IKE, "received %N authentication, but configured %N, "
+ "continue with configured", auth_method_names, auth_method,
+ auth_method_names, this->auth_method);
+ }
+ return NEED_MORE;
+ }
+ case MM_KE:
+ {
+ if (!get_nonce_ke(this, &this->nonce_r, message))
+ {
+ return send_notify(this, INVALID_PAYLOAD_TYPE);
+ }
+ if (!derive_keys(this, this->nonce_i, this->nonce_r))
+ {
+ return send_notify(this, INVALID_KEY_INFORMATION);
+ }
+ return NEED_MORE;
+ }
+ case MM_AUTH:
+ {
+ authenticator_t *authenticator;
+ id_payload_t *id_payload;
+ identification_t *id;
+
+ id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
+ if (!id_payload)
+ {
+ DBG1(DBG_IKE, "IDir payload missing");
+ return send_delete(this);
+ }
+ id = id_payload->get_identification(id_payload);
+ if (!id->matches(id, this->other_auth->get(this->other_auth,
+ AUTH_RULE_IDENTITY)))
+ {
+ DBG1(DBG_IKE, "IDir does not match");
+ id->destroy(id);
+ return send_delete(this);
+ }
+ this->ike_sa->set_other_id(this->ike_sa, id);
+
+ authenticator = create_authenticator(this, id_payload);
+ if (!authenticator || authenticator->process(authenticator,
+ message) != SUCCESS)
+ {
+ DESTROY_IF(authenticator);
+ return send_delete(this);
+ }
+ authenticator->destroy(authenticator);
+ if (!check_constraints(this))
+ {
+ return send_delete(this);
+ }
+ save_auth_cfg(this, FALSE);
+
+ switch (this->auth_method)
+ {
+ case AUTH_XAUTH_INIT_PSK:
+ case AUTH_XAUTH_INIT_RSA:
+ case AUTH_HYBRID_INIT_RSA:
+ /* wait for XAUTH request */
+ return SUCCESS;
+ case AUTH_XAUTH_RESP_PSK:
+ case AUTH_XAUTH_RESP_RSA:
+ case AUTH_HYBRID_RESP_RSA:
+ /* TODO-IKEv1: not yet */
+ return FAILED;
+ default:
+ establish(this);
+ return SUCCESS;
+ }
+ }
+ default:
+ return FAILED;
+ }
+}
+
+METHOD(task_t, get_type, task_type_t,
+ private_main_mode_t *this)
+{
+ return TASK_MAIN_MODE;
+}
+
+METHOD(task_t, migrate, void,
+ private_main_mode_t *this, ike_sa_t *ike_sa)
+{
+ this->ike_sa = ike_sa;
+}
+
+METHOD(task_t, destroy, void,
+ private_main_mode_t *this)
+{
+ DESTROY_IF(this->peer_cfg);
+ DESTROY_IF(this->proposal);
+ DESTROY_IF(this->dh);
+ free(this->dh_value.ptr);
+ free(this->nonce_i.ptr);
+ free(this->nonce_r.ptr);
+ free(this->sa_payload.ptr);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+main_mode_t *main_mode_create(ike_sa_t *ike_sa, bool initiator)
+{
+ private_main_mode_t *this;
+
+ INIT(this,
+ .public = {
+ .task = {
+ .get_type = _get_type,
+ .migrate = _migrate,
+ .destroy = _destroy,
+ },
+ },
+ .ike_sa = ike_sa,
+ .keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa),
+ .initiator = initiator,
+ .state = MM_INIT,
+ );
+
+ if (initiator)
+ {
+ this->public.task.build = _build_i;
+ this->public.task.process = _process_i;
+ }
+ else
+ {
+ this->public.task.build = _build_r;
+ this->public.task.process = _process_r;
+ }
+
+ return &this->public;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-23 21:09:59 +0000